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Statistics Practice Test 1
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© examsnet.com
Question : 13
Total: 37
If mean of y and
1
y
is M, then what is the mean of
y
3
and
1
y
3
?
M
(
M
2
−
3
)
3
M
2
M
3
−
3
M
(
4
M
2
−
3
)
None of these
Validate
Solution:
👈: Video Solution
M
=
y
+
1
y
2
New mean
=
y
3
+
1
y
3
2
=
(
y
+
1
y
)
3
−
3
(
y
+
1
y
)
2
=
(
y
+
1
y
)
[
(
y
+
1
y
)
2
−
3
]
2
=
M
[
(
2
M
)
2
−
3
]
=
M
(
4
M
2
−
3
)
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